The Hollywood couple are already proud parents to a 20-month-old daughter named Wyatt Isabelle

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Ashton Kutcher (R) and Mila Kunis attend a basketball game between the Utah Jazz and the Los Angeles Lakers at Staples Center on January 3, 2014 in Los Angeles, California.

Hollywood's baby boom continues.

Mila Kunis and Ashton Kutcher are expecting their second child together, a rep for the actress confirmed to People Wednesday evening. The Hollywood pair is already proud parents to a 20-month-old daughter named Wyatt Isabelle.

While the announcement comes as a surprise to fans, many followers of the famous pair know that parenthood for these two has been nothing but sweet.

"You think you know how much you can love another person, and then you have a child and you realize you didn't know. It's infinitely rewarding," Ashton shared with Ellen DeGeneres. "I think I really look at this as the greatest opportunity of my life."

"Everything is different, from the fact that you're so happy when you get six hours of sleep to the idea of being responsible for this incredible, living breathing little human being that you can't believe is yours," she told Business Insider last October. When asked if more kids were in her future, she replied, "Not today, but yeah, absolutely. For sure!"

As both parents gear up to expand their family to four, many fans can't help but admire their special bond that first began on the set of "That '70s Show."

"My first real kiss ever was with him on the show. And when 'That '70s Show' had a prom, my date for the prom turned out to be my fiancé. We can honestly say that we went to prom together!" Mila once shared with W Magazine. Never one to miss a joke, she later quipped, "Although I do think that in that episode I went home with someone else. We don't talk about that part."